• SOMNATH ROY

      Articles written in Journal of Biosciences

    • Biological and clinical research on male reproduction and fertility regulation

      Somnath Roy Rabi Prasad Das

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      Biological and clinical research on male reproduction and fertility regulation carried at the National Institute of Health and Family Welfare over the past 17 years has been highlighted in this review. Areas of research covered pertains to hormones in relation to sperm maturation and transport; fertilizing ability of spermatozoa under different experimental conditions; agents producing functional sterility; seasonal variations in primate reproduction; male infertility including semen biochemistry, differential diagnosis between obstructive and non-obstructive azoospermia and hormone therapy; vasectomy, reversible vasocclusion and vasanastomosis; and the use of cyproterone acetate and testosterone enanthate in male rhesus monkey and human volunteers for reversible contraception.

    • Genetic diversity analysis of specialty glutinous and low-amylose rice (Oryza sativa L.) landraces of Assam based on Wx locus and microsatellite diversity

      SOMNATH ROY AMRITA BANERJEE NABANEETA BASAK TORIT BARAN BAGCHI NIMAI PRASAD MANDAL BHASKAR CHANDRA PATRA ANUP KUMAR MISRA SANJEEV KUMAR SINGH RANBIR SINGH RATHI ARUNAVA PATTANAYAK

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      The sticky rice of Assam is traditionally classified as bora (glutinous) and chokuwa (semi-glutinous) basedon their stickiness after cooking. The Waxy (Wx) gene encodes for granule-bound starch synthase (GBSS)that controls the synthesis of amylose, which is a key determinant of rice end-use quality attributes. In thisreport, we analysed the level of variation in grain quality traits in a collection of bora and chokuwacultivars, and examined the nucleotide diversity at the Wx locus of selected rice accessions to identify thepossible cause of low-amylose in these rice cultivar groups. The Wx gene sequencing from 24 bora andchokuwa cultivars revealed several nucleotide variations that can explain the variation in the amylosephenotypes. The nucleotide polymorphisms in the downstream intron regions were similar to those reportedin Bangladeshi Beruin cultivars. Among the Wx polymorphisms, the CTn microsatellite in exon 1 and G/TSNP in intron 1 (G/T-Int1) should be considered for marker assisted breeding involving bora cultivars. TheWx gene tree, classified the bora accessions possessing the G/T-Int1 SNP as japonicas. However, clusteranalysis using microsatellite markers classified the bora and chokuwa cultivars as indica, and intermediateof indica-aus. The findings of this study supplemented our understanding on the evolution of the Wx geneunder human selection. The results will assist plant breeders to effectively improve the bora and chokuwalandraces.

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